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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
OK, I think this is a simple way to help me to improve the descrption(I'm a lazy man, I love copy&paste ;-)
OK, I modified the description(Even though I don't fully understand what it means ;-). How about the new description?
Yes,I can see the image now, let me look into it..
Soooorry, I can't open your link, because I come from China, a lot of link often like this(can not open and view)
I don't know which part is unclear, about Collatz conjecture or Kata's task?